What Is Phytol? Chlorophyll, Uses and Inhalation Safety

What is phytol?

Phytol is a long-chain alcohol in the diterpenoid family. The ChEBI chemical database classifies it as a diterpenoid and a plant metabolite. The NIST Chemistry WebBook records its formula as C20H40O and its CAS identifier as 150-86-7.

The formula means 20 carbon atoms, 40 hydrogen atoms and one oxygen atom. “Alcohol” describes a chemical group in the molecule; it does not mean drinking alcohol.

Phytol therefore differs from familiar 10-carbon monoterpenes such as pinene. Our terpenes vs. terpenoids guide explains how carbon counts and oxygen help distinguish these families.

How is phytol connected to chlorophyll?

A phytol-derived chain forms the tail of chlorophyll. As chlorophyll breaks down in plants, free phytol can be released. A 2021 plant study investigated how that released phytol is metabolized through a compound called phytenal.

This distinction matters: phytol bound into a larger pigment molecule and isolated free phytol are different chemical contexts. A finding about one exposure should not be transferred automatically to the other.

What does phytol smell like, and what is it used for?

The FEMA Flavor Library lists phytol as ingredient 4196, with a flower flavor-profile descriptor and JECFA number 1832. This documents a flavoring context; it does not establish a particular therapeutic effect.

FEMA explains that its Flavor Ingredient Library concerns intended uses as flavor ingredients. A separate FEMA safety-assessment explanation distinguishes ingestion in food from inhalation exposure.

Is phytol safe to vape?

A 2021 study in Inhalation Toxicology compared inhaled phytol with propylene glycol in rats. Phytol exposure caused severe respiratory injury, weight loss and deaths. The phytol groups were stopped after one or two exposure days.

The researchers did not establish a safe exposure range for phytol and recommended against its use as a vaping excipient, meaning an added formulation ingredient. The result should not be read as proof that every other vaping ingredient is safe.

What the study can and cannot tell us

In its January 2021 response, Health Canada treated the findings as a potential human-health concern while explaining their limits. The rat exposures were high, some lasted up to six hours daily, and the generated aerosols might differ from those produced by vape devices.

Health Canada also identified the study as sponsored by Canopy Growth. It encouraged producers to review formulations containing added phytol and consider removing it. That was a precautionary response, not a measurement of the risk from every finished product.

The practical conclusion is to avoid assuming that “plant-derived” or “flavoring” establishes inhalation safety. These sources do not provide a safe do-it-yourself mixing level.

Check the claim before drawing a conclusion

For more on interpreting studies, read how to read cannabis research.

Common questions about phytol

Keep exploring

Sources are linked beside the relevant claims. Historical safety communications are identified by date.